Engine running cooler?

[Tim Klassen]

I have a 6BTA 370. The water temp gauge reads about 10 degrees cooler than it used to. Unfortunately, I don’t know exactly when this started. I removed the engine last year and unplugged the sending unit at that time. I keep current on all maintenance and there has been so significant change in the cooling system. What is the best way to check the gauge for accuracy?

Topic

[Rob Schepis]

Single engine I presume.., so a gauge/sender swip-swap is not an option. Then simplest thing is to use an infrared temperature gun and shoot the head right next to the factory sender. It should be a few degrees less than actual coolant temperature.

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